You have to learn (I know, it stinks having to grow up!) TV, Movies, and Music (ad most 'news' casts) are NOT real. It is ALL dramatized, and made 'better' for you and I to enjoy. The Titanic was a huge disaster. But to pick out just two people and 'make up' a supposed romance is SO wrong. It totally disrespects the thousands who died that cold morning in the North Atlantic. I know this is not what you were asking about, but Jack and Rose are just a small portion of the huge tragedy that happened.
Jack freezes and drowns, Rose survives and has a long interesting life. She throws the multimillion dollar necklace into the ocean. (Thanks for nothing grandma !) She goes to bed and dies in her sleep. In the afterlife, all the dead Titanic passengers and crew welcome her and she is reunited with Jack.